did you see this (i've snipped the good part)
http://support.microsoft.com/kb/306667/en-us
Server Certificate Button Unavailable in IIS
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Article ID : 306667
Last Review : June 30, 2004
Revision : 1.0
This article was previously published under Q306667
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SYMPTOMS
CAUSE
RESOLUTION
MORE INFORMATION
Steps to Reproduce the Behavior
REFERENCES
SYMPTOMS
When you try to generate a certificate request by using the Internet Information Services (IIS) Certificate Wizard from the properties of a site, the Server Certificate button may be unavailable or you may receive an error message similar to the following:
The Instruction at "0X64e6a38e" referenced memory at 0X00000000. The memory could not be "read".
Note You may also see the IIS Manager close without error.
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CAUSE
The Xenroll.dll file is not properly registered.
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RESOLUTION
Xenroll.dll is located in the \Winnt\System32 directory. Follow these steps to reregister Xenroll.dll: 1. Open Windows Explorer, expand the Winnt directory, and then click the System32 directory.
2. Click Start, click Run, and then type Regsvr32 in the text box.
3. In Windows Explorer, locate Xenroll.dll in the \Winnt\System32 directory, and then drag Xenroll.dll into the text box that is described in step 2.
4. Click OK. A message box states that the Xenroll.dll registration is successful.